A high-efficiency and stable electrolytic cell

Abstract

The present invention provides an efficient and stable electrolytic cell, including a main cell body and a reflux cell body; the main cell body includes a cell bottom plate, a cell side plate and a cell cover, an inclined plate for protecting the main weld between the cell bottom plate and the cell side plate is welded between the cell bottom plate and the cell side plate, a plurality of groups of electrode plate groups are arranged at intervals along the length direction inside the main cell body, the electrode plate group includes two electrode plates arranged oppositely up and down, an electrode positioning frame for positioning and fixing the electrode plate group is provided in the main cell body, and an immersion roller is provided in the reflux cell body. The invention adopts a number of protective and stable measures, using an inclined plate to isolate the main weld of the cell body from the electrolyte, thereby avoiding corrosion and oxidation of the main weld by the electrolyte and causing leakage; at the same time, an electrode positioning frame and an electrode protection plate are provided, while reducing the damage to the cell body caused by thermal expansion and contraction of the electrode plate, the upper and lower electrode plates are integrated, the overall electrode plate group is less deformed, and the effective area of ​​the electrode plate can be increased, the energy medium consumption can be reduced, and the protection plate can be prevented from falling off.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical strip surface treatment, and in particular relates to a highly efficient and stable electrolytic cell. Background Art

[0002] During the annealing of cold-rolled stainless steel, since the annealing furnace combustion flue gas contains a certain amount of oxidizing gases, such as O2 and H2O, several thin and dense oxide scales containing elements such as iron, chromium, nickel, manganese, and silicon will be generated on the surface of the strip. There will also be a chromium-poor layer on the side of the strip close to the substrate. These factors will lead to a decrease in the corrosion resistance of the strip and an increase in surface roughness. In order to meet the surface quality requirements of the strip, it is necessary to remove the oxide scale and the chromium-poor layer through physical and chemical surface treatment processes. For chromium and iron oxides, it is a common method to use electrochemical action to dissolve the oxide scale. Because the commonly used media in the electrolytic system contain strong oxidizing and corrosive media such as Cr6+, nitric acid, and sulfuric acid, the electrolytic cell generally uses low-carbon steel lined rubber lined brick cell, pure metal cell, plastic cell, etc., but from the perspective of investment and operation and maintenance, the existing electrolytic cells have the following disadvantages:

[0003] (1) Low-carbon steel rubber-lined brick-lined tank body, in order to prevent the electrolyte from penetrating the rubber layer and brick layer to corrode the steel tank base, high quality requirements are placed on the rubber-lined bricks. However, due to changes in electrolytic parameters during production or shutdown maintenance, the temperature of the electrolytic tank will change greatly, and the expansion coefficients between the clay layer, brick layer, rubber layer and steel base are inconsistent, so it is inevitable that the thermal expansion and contraction displacements of each layer will be different, which is likely to cause tank leakage over time. Steel rubber-lined brick-lined tank bodies are difficult to maintain because it is difficult to determine the location of the leak.

[0004] (2) The pure metal tank body is resistant to the strong oxidation and corrosion of the electrolyte, and needs to be made of materials such as high silicon cast iron. Although high silicon cast iron has excellent corrosion resistance, it has high hardness and poor mechanical properties, which not only results in high investment costs but also makes manufacturing, processing and subsequent maintenance difficult.

[0005] (3) Plastic tank, commonly used PPH tank, has the advantages of good corrosion resistance, high cost performance, easy manufacturing and maintenance, but the Cr in the electrolyte 6 +, NO3 - Strong oxidizing ions such as ions will cause oxidative corrosion to the welds of the tank, resulting in a shortened tank life. Summary of the invention

[0006] The purpose of the present invention is to provide a highly efficient and stable electrolytic cell in view of the above-mentioned defects of the existing plastic cell body, thereby achieving the purpose of preventing the main weld of the cell body from being oxidized.

[0007] To this end, the present invention provides an efficient and stable electrolytic cell, comprising a main cell body and a reflux cell body arranged at both ends of the main cell body; the main cell body comprises a cell bottom plate, a cell side plate and a cell cover, an inclined plate for protecting the main weld between the cell bottom plate and the cell side plate is welded between the cell bottom plate and the cell side plate, a plurality of groups of electrode plate groups are arranged at intervals along the length direction of the main cell body, the electrode plate group comprises two electrode plates arranged opposite to each other up and down, an electrode positioning frame for positioning and fixing the electrode plate group is provided in the main cell body, and an immersion roller for immersing the strip steel in the electrolyte in the main cell body is provided in the reflux cell body.

[0008] Furthermore, the head and tail of each electrode plate group are provided with an electrode protection plate to prevent the strip steel from contacting the electrode plate.

[0009] Furthermore, the electrode protection plate is a sawtooth structure, including a top plate, a bottom plate, a front side plate and a rear side plate. The top plate and the bottom plate are a whole piece of sawtooth plate. The sawtooth ends of the top plate and the bottom plate are welded through the rear side plate, and the side of the top plate and the bottom plate opposite to the sawtooth end is welded through the front side plate. The bottom plate extends outward by 3 to 10 mm than the top plate, and one side of the bottom plate of the electrode protection plate is arranged close to the strip steel.

[0010] Furthermore, the top plate, bottom plate, front side plate and rear side plate are all made of plastic material resistant to electrolyte corrosion.

[0011] Furthermore, the electrode positioning frame includes a positioning frame, positioning pins and support blocks. The positioning frame is placed above the outer edge of the side wall of the main trough body. The support block is divided into upper and lower layers and is stacked and placed between the positioning frame and the outer edge of the side wall of the main trough body. The edges of the upper and lower electrode plates are respectively fixed in the upper and lower support blocks. The positioning frame, support blocks and the outer edge of the side wall of the main trough body are fixed by positioning pins, and adjacent electrode positioning frames are separated by plastic sheets.

[0012] Furthermore, the positioning frame and the positioning pins are made of metal, and the supporting block is made of plastic.

[0013] Furthermore, U-shaped steel structures are evenly distributed on the side plates of the trough.

[0014] Furthermore, a support roller for supporting the strip steel is arranged between two adjacent electrode plate groups.

[0015] Furthermore, a cover opening machine for opening and closing the tank cover is also provided on the main tank body.

[0016] Furthermore, a squeeze roller is provided on the strip steel inlet and outlet sides of the reflux tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The efficient and stable electrolytic cell provided by the present invention protects the main weld by providing an inclined plate, so that the main weld does not have to be in direct contact with the electrolyte, effectively solving the problem that the main weld of the existing plastic cell body is easily oxidized and corroded, thereby increasing the service life of the electrolytic cell.

[0019] (2) The efficient and stable electrolytic cell provided by the present invention has electrode protection plates at the head and tail of the electrode plate group, but no protection plate is arranged in the middle of the electrode plate. Compared with the traditional grid protection plate type, it not only greatly increases the effective area of ​​the electrode plate, shortens the length of the electrolytic cell, reduces the number of electrode plates and energy medium consumption, but also, when the strip shape defects pass through the electrode plate, it will not directly wear the weld of the protection plate, causing the protection plate to fall off, damage the electrode and strip steel, or even cause electrolyte overflow accidents.

[0020] (3) The efficient and stable electrolytic cell provided by the present invention adopts a U-shaped steel structure for outer wall protection, which reduces the amount of main cell plate material used while enhancing the strength of the main cell body. At the same time, the electrode plate group is positioned and fixed by an electrode positioning frame, which reduces the stress on the cell body caused by thermal expansion and contraction of the electrode plates and causes damage. At the same time, the upper and lower electrode plates are integrated, and the overall deformation of the electrode plate group is small, thereby improving the stability of the electrolytic cell.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a highly efficient and stable electrolytic cell of the present invention;

[0023] Figure 2 It is a schematic diagram of the main weld protection of the main tank body in the present invention;

[0024] Figure 3 It is a schematic diagram of the installation structure of the electrode plate and guard plate in the present invention;

[0025] Figure 4 It is a structural schematic diagram of the electrode positioning frame in the present invention.

[0026] Explanation of the reference numerals: 1. Reflux tank body; 2. Immersion roller; 3. Main tank body; 4. Tank side plate; 5. U-shaped steel structure; 6. Tank cover; 7. Lid opener; 8. Electrode positioning frame; 9. Electrode plate; 10. Electrode protection plate; 11. Support roller; 12. Squeeze roller; 13. Inclined plate; 14. Tank bottom plate; 15. Top plate; 16. Bottom plate; 17. Front side plate; 18. Rear side plate; 19. Positioning frame; 20. Support block; 21. Positioning pin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] like Figure 1 and Figure 2As shown, this embodiment provides an efficient and stable electrolytic cell, including a main cell body 3, and a reflux cell body 1 arranged at both ends of the main cell body 3; the main cell body 3 includes a cell bottom plate 14, a cell side plate 4 and a cell cover 6, the cell bottom plate 14 and the cell side plate 4 are welded to form a main weld, and in order to avoid oxidative corrosion of the electrolyte to the main weld, which affects the life of the cell body, an inclined plate 13 for protecting the main weld is continuously welded between the cell bottom plate 14 and the cell side plate 4, specifically, the inclined plate 13 can be one or more, and the main weld can be made The seam does not need to be in direct contact with the electrolyte, thus avoiding the electrolyte leakage accident caused by oxidation and cracking of the main weld. At the same time, if the weld between the inclined plate 13 and the tank bottom plate 14 and the tank side plate 4 is corroded, it can be relatively convenient to replace the section or the whole, which does not affect the strength of the main tank body 3 and greatly improves the life of the tank body. The tank cover 6 seals the main tank body 3 to avoid the overflow of corrosive and highly oxidizing acid mist in the main tank body 3. In order to facilitate the opening and closing of the tank cover 6, the main tank body 3 is also provided with a cover opening machine 7 for opening and closing the tank cover 6. The main tank body 3 is provided with multiple groups of electrode plate groups at intervals along its length direction. The electrode plate groups include two electrode plates 9 arranged opposite to each other up and down. The main tank body 3 is provided with an electrode positioning frame 8 for positioning and fixing the electrode plate group. The electrode positioning frame 8 makes the position of the electrode plate group relatively fixed, reducing the damage to the tank body caused by thermal expansion and contraction of the electrode plate 9; the reflux tank body 1 is provided with an immersion roller 2 for immersing the strip steel in the electrolyte in the main tank body 3, and the strip steel can pass through the upper and lower electrode plates 9 under the action of tension through the immersion roller 2. Optimally, a support roller 11 for supporting the strip steel is provided between two adjacent electrode plate groups to prevent the strip steel from sinking under the action of gravity and contacting the electrode plate 9, thereby scratching the surface of the strip steel; a squeeze roller 12 is provided on the side of the reflux tank body 1 away from the main tank body 3. In this embodiment, the main tank body 3 and the reflux tank body 1 are both plastic tank bodies resistant to electrolyte corrosion, and can be made of materials such as PPH, PVDF, HDPE, etc. In this way, the efficient and stable electrolytic cell of this embodiment, while based on the advantages of the plastic material tank body, takes measures to avoid oxidation of the main weld of the tank body, thereby increasing the service life of the tank body.

[0031] When the steel strip passes through the electrode plate group, it is easy to contact the upper and lower electrode plates 9 and scratch the surface of the steel strip due to the side waves, sickle bends or loss of tension of the steel strip itself. Therefore, the electrode plates 9 are generally provided with a grid-type plastic protective plate. However, the conventional grid-type plastic protective plate blocks the effective range of the electrode plate 9 on the one hand, and the weld position is easy to fall off as the steel strip is scratched, thereby blocking the reflux port of the tank body and causing the tank body liquid to overflow. Based on this, in this embodiment, only the head and tail of each electrode plate 9 are provided with an electrode protection plate 10 to prevent the steel strip from contacting the electrode plate 9, and no electrode protection plate 10 is provided in the middle of the electrode plate 9. By utilizing the rigidity of the steel strip itself, when the steel strip has defects such as loss of tension or sickle bend, in the length and width direction of the electrode plate 9, the first thing that the steel strip contacts is the electrode protection plate 10. At the same time, the installation form of the electrode protection plate 10 in this embodiment greatly increases the effective area of ​​the electrode plate 9, reduces the number of electrode plates 9 and the energy medium consumption, and effectively protects the steel strip and the electrode plate 9. Specifically, Figure 3 As shown, the electrode protection plate 10 is a sawtooth structure, including a top plate 15, a bottom plate 16, a front side plate 17 and a rear side plate 18. The top plate 15 and the bottom plate 16 are a whole sawtooth plate without a welded structure. The sawtooth ends of the top plate 15 and the bottom plate 16 are welded through the rear side plate 18, and the side of the top plate 15 and the bottom plate 16 opposite to the sawtooth end is welded through the front side plate 17. The bottom plate extends 3 to 10 mm outward than the top plate. When the electrode protection plate is installed on the electrode plate, one side of the bottom plate of the electrode protection plate is arranged close to the strip steel, so that in the running direction of the strip steel, the weld will not be directly scratched by the strip steel, and the plastic plate will not fall off. The top plate 15, the bottom plate 16, the front side plate 17 and the rear side plate 18 are all made of plastic materials resistant to electrolyte corrosion, such as PPH, PVDF, HDPE, UHMWPE and the like.

[0032] The structure of the electrode positioning frame 8 is refined, such as Figure 4 As shown, the electrode positioning frame 8 includes a positioning frame 19, a positioning pin 21 and a support block 20. The positioning frame 19 is placed above the outer edge of the side wall of the main tank body 3. The support block 20 is divided into two layers, upper and lower, and is placed between the positioning frame 19 and the outer edge of the side wall of the main tank body 3. The edges of the electrode plates 9 symmetrically arranged above and below are respectively fixed in the upper and lower support blocks 20. The positioning frame 19, the support block 20 and the outer edge of the side wall of the main tank body 3 are fixed by the positioning pin 21. In this way, the upper and lower electrode plates 9 are integrated through the electrode positioning frame 8, avoiding the misalignment of the electrode plates 9 due to the movement of the support block, and ensuring the stability of the installation of the electrode plates 9; further, adjacent electrode positioning frames 8 are separated by plastic sheets. Specifically, the positioning frame 19 and the positioning pin 21 are made of metal, and the support block 20 is made of plastic.

[0033] In addition, U-shaped steel structures 5 are evenly distributed on the tank side plates 4. While strengthening the structure of the tank side plates 4, the U-shaped steel structures 5 can expand and contract with the main tank body 3, effectively support the load of the electrode plate 9, and avoid deformation of the tank body and tearing of the main weld, further ensuring the stability of the electrolytic cell.

[0034] In summary, the efficient and stable electrolytic cell provided by the present invention adopts multiple protection and stabilization measures, and uses inclined plates to isolate the main weld of the cell body from the electrolyte, thereby preventing the electrolyte from corroding and oxidizing the main weld and causing leakage; a practical, stable, and small-footprint electrode protection plate form is adopted, which not only greatly increases the effective area of ​​the electrode plate compared to the traditional grid protection plate type, shortens the length of the electrolytic cell, and reduces the energy medium consumption, but also does not directly wear the protection plate weld when the strip plate defect passes through the electrode plate, causing the protection plate to fall off, damaging the electrode and the strip, and even causing an electrolyte overflow accident; the cell side plate is protected by an outer wall U-shaped steel structure, which reduces the amount of main cell body plate material while strengthening the strength of the main cell body; an electrode positioning frame is also provided for the electrode plate group, which reduces the stress on the cell body caused by thermal expansion and contraction of the electrode plate and causes damage, while also integrating the upper and lower electrode plates and the support plate, and the overall electrode plate group has little deformation.

[0035] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims

1. An efficient and stable electrolytic cell, characterized in that: The invention comprises a main tank body and a reflux tank body arranged at both ends of the main tank body; the main tank body comprises a tank bottom plate, a tank side plate and a tank cover, an inclined plate for protecting the main weld between the tank bottom plate and the tank side plate is welded between the tank bottom plate and the tank side plate, a plurality of groups of electrode plate groups are arranged at intervals along the length direction of the main tank body, the electrode plate group comprises two electrode plates arranged opposite to each other up and down, an electrode positioning frame for positioning and fixing the electrode plate group is arranged in the main tank body, and an immersion roller for immersing the strip steel in the electrolyte in the main tank body is arranged in the reflux tank body; The head and tail of each electrode plate group are provided with an electrode protection plate to prevent the strip steel from contacting the electrode plate. The electrode protection plate is a serrated structure, including a top plate, a bottom plate, a front side plate and a rear side plate. The top plate and the bottom plate are a whole piece of serrated plate. The serrated ends of the top plate and the bottom plate are welded through the rear side plate, and the side of the top plate and the bottom plate opposite to the serrated ends are welded through the front side plate. The bottom plate extends outward by 3 to 10 mm than the top plate, and one side of the bottom plate of the electrode protection plate is arranged close to the strip steel; U-shaped steel structures are evenly distributed on the trough side plates.

2. A highly efficient and stable electrolytic cell as claimed in claim 1, characterized in that: The top plate, bottom plate, front side plate and rear side plate are all made of plastic material resistant to electrolyte corrosion.

3. The efficient and stable electrolytic cell according to claim 1, characterized in that: The electrode positioning frame includes a positioning frame, positioning pins and support blocks. The positioning frame is placed above the outer edge of the side wall of the main tank body. The support block is divided into upper and lower layers and is stacked and placed between the positioning frame and the outer edge of the side wall of the main tank body. The edges of the upper and lower electrode plates are respectively fixed in the upper and lower support blocks. The positioning frame, support blocks and the outer edge of the side wall of the main tank body are fixed by positioning pins, and adjacent electrode positioning frames are separated by plastic plates.

4. A highly efficient and stable electrolytic cell as claimed in claim 3, characterized in that: The positioning frame and the positioning pins are made of metal, and the supporting block is made of plastic.

5. The efficient and stable electrolytic cell according to claim 1, characterized in that: A supporting roller for supporting the strip steel is arranged between two adjacent electrode plate groups.

6. The efficient and stable electrolytic cell according to claim 1, characterized in that: The main tank body is also provided with a cover opening machine for opening and closing the tank cover.

7. The efficient and stable electrolytic cell according to claim 1, characterized in that: The strip steel inlet and outlet sides of the reflux tank are provided with squeeze rollers.

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